Biantennary Oligosaccharide Synthesis With Selective Deprotection
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Solution Overview
Problem
Existing methods for synthesizing biantennary N-glycans with an α2,6-sialic acid structure face challenges in yield, selectivity, efficiency, and cost, particularly in large-scale production, due to issues with selective sugar moiety conversion, low reactivity, and inefficient purification, especially in the presence of impurities and isomers.
Innovation Solution
A novel method involving specific glycosidic linkages and the use of perfluorocarboxylic acid esters and strong bases in alcohol solvents, combined with hydrophobic carriers for purification, to produce biantennary oligosaccharides efficiently, including steps for protecting and deprotecting hydroxyl groups and amino groups, and crystallization to remove impurities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If semi-chemical synthesis using natural extracts is used, then fewer synthesis steps are required, but large amounts of raw materials and special purification equipment are needed
Solution Approach 1:
The patent uses chemically synthesized monosaccharide building blocks with protecting groups instead of natural extracts. These synthetic intermediates can be prepared in advance and stored, eliminating the need for large amounts of perishable natural materials like egg yolks while maintaining synthesis efficiency
Solution Approach 2:
The patent changes the chemical parameters of the building blocks by using monosaccharides with specific protecting groups (benzyl, silyl, acetyl groups) that can be selectively removed. This allows precise control over the synthesis process and eliminates the need for special purification equipment required by natural extract methods
2Adaptability or versatility
If pure chemical synthesis is used, then flexibility in production quantity is improved, but synthesis steps and purification complexity increase
Solution Approach 1:
The patent segments the glycan synthesis into modular monosaccharide units with specific protecting groups. Each unit can be independently synthesized and then assembled through glycosidic bond formation. This modular approach allows flexible production scaling without proportionally increasing purification complexity, as each module follows the same synthesis and purification protocol
Solution Approach 2:
The patent uses protecting groups (benzyl, silyl, acetyl) as intermediaries that temporarily mask reactive hydroxyl groups during synthesis. These protecting groups simplify purification by preventing unwanted side reactions and can be selectively removed later, reducing the overall purification complexity compared to unprotected glycan synthesis
3Ease of manufacture
If conventional glycosylation methods are used, then standard procedures are available, but yield and selectivity are low due to difficult sugar moiety conversion
Solution Approach 1:
The patent applies different protecting groups (benzyl, silyl, acetyl) to specific hydroxyl positions on monosaccharide units based on their local chemical environment and reactivity. This localized differentiation allows selective glycosylation at specific positions while protecting others, dramatically improving both yield and selectivity compared to conventional methods that treat all hydroxyl groups uniformly
Solution Approach 2:
The patent replaces conventional glycosylation promoters with silyl-based promoters (e.g., trimethylsilyl trifluoromethanesulfonate). This substitution provides milder reaction conditions that improve selectivity for the desired glycosidic bond formation while maintaining ease of procedure through standardized reaction protocols
4Manufacturing precision
If chromatography purification on silica gel column is used, then isomers and impurities can be removed, but the process is not suitable for scale-up and requires precise operations
Solution Approach 1:
The patent uses crystallization as a disposable, one-step purification method instead of scalable chromatography. The final deprotected oligosaccharide product crystallizes directly from the reaction mixture or after simple solvent removal, providing high purity without requiring precise chromatographic operations. This crystallization step can be easily scaled up by simply increasing the reaction volume and adjusting solvent ratios
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The method achieves high yield and selectivity in producing biantennary oligosaccharides with an α2,6-sialic acid structure, suitable for industrial-scale synthesis, by addressing issues of impurity removal and reaction control, thereby enhancing production efficiency and purity.
Implementation Method 1
reacting the compound represented by Formula A-6 with a strong base in the presence of an alkyl ester of perfluorocarboxylic acid to give the compound represented by Formula A-7
Implementation Method 2
adding a hydrophobic carrier and water to a water-soluble organic solvent containing the resulting compound represented by Formula A-5 and contaminants to adsorb the compound represented by Formula A-5 onto the hydrophobic carrier
Implementation Method 3
reacting the compound represented by Formula A-6 with a strong base in the presence of an alkyl ester of perfluorocarboxylic acid
Data Source
AI summary
The objective of the invention is to provide a novel oligosaccharide, which can be used for producing a biantennary glycan having an α2,6-sialic acid structure at a non-reducing end, a method for production thereof, production intermediates thereof and a method for producing the intermediates, as well as a novel oligosaccharide, which is a biantennary glycan having an α2,6-sialic acid structure at a non-reducing end, a method for producing the oligosaccharide, intermediates thereof, and a method for producing the intermediates. Provided are a novel oligosaccharide represented by Formula A-13 or D-13:a method for producing the oligosaccharide represented by Formula A-13 or Formula D-13 shown in, for example, FIG. 1 or FIG. 3, intermediates thereof and a method for producing the intermediates.